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Structural Insights and Functional Dynamics of β-Lactoglobulin Fibrils
Rebecca Sternke-Hoffmann1, David Rhyner2, Genki Terashi3
1PSI Center for Life Sciences, Paul Scherrer Institute, Forschungsstrasse 111, CH-5232 Villigen, PSI, Switzerland.
Nano Letters
|October 23, 2025
Summary
Beta-lactoglobulin (β-LG) amyloid fibrils offer tunable properties for nanotechnology. Understanding their dynamic structure, particularly the fuzzy coat
Area of Science:
- Biomaterials Science
- Nanotechnology
- Protein Chemistry
Background:
- Beta-lactoglobulin (β-LG) amyloid fibrils are biocompatible nanomaterials.
- Their tunable surface chemistry and functional molecule binding capacity are valuable.
- Understanding fibril dynamics is crucial for rational nanomaterial design.
Purpose of the Study:
- Investigate the dynamic architecture of β-LG fibrils.
- Elucidate the relationship between fibril flexibility and functional potential.
- Provide mechanistic insights for engineering β-LG-based nanomaterials.
Main Methods:
- Cryo-electron microscopy (cryo-EM) for structural visualization.
- Small-angle X-ray scattering (SAXS) for structural analysis.
- Molecular dynamics (MD) simulations for modeling flexible domains.
Main Results:
- Cryo-EM revealed a monomeric polymorph with a conserved core and a disordered 'fuzzy coat'.
- MD simulations identified a stable conformation for flexible domains (Asn90-Thr97).
- Increased ionic strength decreased coat flexibility and enhanced iron binding, indicating environmental responsiveness.
Conclusions:
- Fibril flexibility is linked to functional potential in β-LG nanomaterials.
- Environmental factors like ionic strength modulate fibril properties.
- Mechanistic insights support the rational engineering of β-LG-based nanostructures.
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